Cargando…

SLAIN2 links microtubule plus end–tracking proteins and controls microtubule growth in interphase

The ends of growing microtubules (MTs) accumulate a set of diverse factors known as MT plus end–tracking proteins (+TIPs), which control microtubule dynamics and organization. In this paper, we identify SLAIN2 as a key component of +TIP interaction networks. We showed that the C-terminal part of SLA...

Descripción completa

Detalles Bibliográficos
Autores principales: van der Vaart, Babet, Manatschal, Cristina, Grigoriev, Ilya, Olieric, Vincent, Gouveia, Susana Montenegro, Bjelić, Saša, Demmers, Jeroen, Vorobjev, Ivan, Hoogenraad, Casper C., Steinmetz, Michel O., Akhmanova, Anna
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Rockefeller University Press 2011
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3115796/
https://www.ncbi.nlm.nih.gov/pubmed/21646404
http://dx.doi.org/10.1083/jcb.201012179
Descripción
Sumario:The ends of growing microtubules (MTs) accumulate a set of diverse factors known as MT plus end–tracking proteins (+TIPs), which control microtubule dynamics and organization. In this paper, we identify SLAIN2 as a key component of +TIP interaction networks. We showed that the C-terminal part of SLAIN2 bound to end-binding proteins (EBs), cytoplasmic linker proteins (CLIPs), and CLIP-associated proteins and characterized in detail the interaction of SLAIN2 with EB1 and CLIP-170. Furthermore, we found that the N-terminal part of SLAIN2 interacted with ch-TOG, the mammalian homologue of the MT polymerase XMAP215. Through its multiple interactions, SLAIN2 enhanced ch-TOG accumulation at MT plus ends and, as a consequence, strongly stimulated processive MT polymerization in interphase cells. Depletion or disruption of the SLAIN2–ch-TOG complex led to disorganization of the radial MT array. During mitosis, SLAIN2 became highly phosphorylated, and its interaction with EBs and ch-TOG was inhibited. Our study provides new insights into the molecular mechanisms underlying cell cycle–specific regulation of MT polymerization and the organization of the MT network.